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Abstract

High density packaging of discrete electronic devices, such as terminating resistors, has resulted in the requirement that in some cases these devices must be pluggable. Pluggability of discrete devices via connectors into printed circuit boards is advantageous from board test and field repair standpoints. This same pluggability, especially considering a plurality of devices, gives rise to problems concerning the retention of such devices in their respective connector sockets. This becomes especially critical under conditions of vibration and shock which might tend to cause the devices to work their way loose from their connectors, thereby causing electrical circuit malfunctions.

Country

United States

Language

English (United States)

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Electronic Device Retainer

High density packaging of discrete electronic devices, such as terminating
resistors, has resulted in the requirement that in some cases these devices must
be pluggable. Pluggability of discrete devices via connectors into printed circuit
boards is advantageous from board test and field repair standpoints. This same
pluggability, especially considering a plurality of devices, gives rise to problems
concerning the retention of such devices in their respective connector sockets.
This becomes especially critical under conditions of vibration and shock which
might tend to cause the devices to work their way loose from their connectors,
thereby causing electrical circuit malfunctions. The invention described herein
provides a positive method of retaining discrete devices to PC boards as well as
access of cooling air and device visibility. Fig. 1 shows three views of the device.
As can be seen, it consists of a pair of side rails 1, which limit the side motion of
the electrical devices and thereby protect them from damage. Spanning between
the side rails are a series of beams 2. Each beam serves as a support for two
cantilever retaining springs 3. Each cantilever spring provides the restraint for a
row of terminating resistors 4. This symmetrical placement of the retaining
springs has two advantages. First, the number of support beams 2 is reduced by
one half, and, second, twisting stresses are virtually eliminated in the support
beam reducin...